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@article{349853,
author = {Bůžek, Vladimír and Hillery, M.},
article_location = {USA},
article_number = {02},
keywords = {STATES; CLONING; SEPARABILITY; INFORMATION; ENSEMBLES},
language = {eng},
issn = {1050-2947},
journal = {Physical Review A},
title = {Optimal manipulations with qubits: Universal quantum entanglers},
url = {http://publish.aps.org/abstract/PRA/v62/e022303},
volume = {62},
year = {2000}
}
TY - JOUR
ID - 349853
AU - Bůžek, Vladimír - Hillery, M.
PY - 2000
TI - Optimal manipulations with qubits: Universal quantum entanglers
JF - Physical Review A
VL - 62
IS - 02
SP - 2303
EP - 2303
PB - American Physical Society
SN - 10502947
KW - STATES
KW - CLONING
KW - SEPARABILITY
KW - INFORMATION
KW - ENSEMBLES
UR - http://publish.aps.org/abstract/PRA/v62/e022303
N2 - We analyze various scenarios for entangling two initially unentangled qubits. In particular, we propose an optimal universal entangler that entangles a qubit in unknown state \psi] with a qubit in a reference (known) state \0]. That is, our entangler generates the output state that is as close as possible to the pure (symmetrized) state (\psi]\0]+\0]\psi]). The most attractive feature of this entangling machine, is that the fidelity of its performance (i.e., the distance between the output and the ideally entangled-symmetrized state) does not depend on the input and takes the constant value F = (9 + 3 root 2)/14 similar or equal to 0.946. We also analyze how to optimally generate from a single qubit initially prepared in an unknown state \psi]) a two qubit entangled system, which is as close as possible to a Bell state (\psi]\psi(perpendicular to)]+\psi(perpendicular to)]\psi]), where [psi\psi(perpendicular to)] = 0.
ER -
BŮŽEK, Vladimír a M. HILLERY. Optimal manipulations with qubits: Universal quantum entanglers. \textit{Physical Review A}. USA: American Physical Society, 2000, roč.~62, č.~02, s.~2303-2313. ISSN~1050-2947.
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